The woman spent five days in hospital with serious injuries before her death.
The suspect is due to appear in court on Monday
Meanwhile, the Deputy Prime Minister, Fiame Naomi Mataafa, has spoken about domestic violence at the the Asia Pacific Broadcasting Union conference currently underway in Apia.
Fiame told the conference, domestic violence is restraining development.
"In the Pacific, I think the impact of domestic violence on the development of a country has serious significance.
